bisthiolation of terminal alkynes, K2S (potassium sulfide) and diaryliodoniumsalts for the assembly of functionalized (Z)‐1,2‐bis(arylthio)alkene derivatives has been accomplished for the first time. This unique observation features a broad substrate scope, excellent functional‐group tolerance, and high regioselectivity. Especially, an arylthiolate anion from diaryliodoniumsalts and potassium sulfide
Palladium-catalyzed bisthiolation of terminal alkynes for the assembly of diverse (<i>Z</i>)-1,2-bis(arylthio)alkene derivatives
作者:Yin-Long Lai、Shaoxi Yan、Dan He、Li-Zhen Zhou、Zi-Shen Chen、Yu-Long Du、Jianxiao Li
DOI:10.1039/d1ra05773a
日期:——
An efficient and straightforward palladium-catalyzed three-component cascade bisthiolation of terminalalkynes and arylhydrazines with sodium thiosulfate (Na2S2O3) as the sulfur source for the assembly of functionalized (Z)-1,2-bis(arylthio)alkene derivatives is described. Using 0.5 mol% IPr–Pd–Im–Cl2 as the catalyst, a wide range of terminalalkynes and arylhydrazines are well tolerated, thus producing
以硫代硫酸钠 (Na 2 S 2 O 3 ) 作为硫源组装官能化 ( Z )-1,2-双(芳硫基)烯烃的高效且直接的钯催化三组分级联双硫醇末端炔烃和芳基肼衍生品进行了描述。使用 0.5 mol% IPr–Pd–Im–Cl 2作为催化剂,可以很好地耐受多种末端炔烃和芳基肼,从而以良好的收率生产所需的产物,具有良好的官能团耐受性和优异的区域选择性。此外,该协议可以很容易地扩大规模,显示出在有机合成和材料科学中的潜在应用。
Highly Stereoselective One-Pot Procedure To Prepare Bis- and Tris-chalcogenide Alkenes via Addition of Disulfides and Diselenides to Terminal Alkynes
作者:Angélica Venturini Moro、Cristina W. Nogueira、Nilda B. V. Barbosa、Paulo Henrique Menezes、João Batista Teixeira da Rocha、Gilson Zeni
DOI:10.1021/jo050448o
日期:2005.6.1
conditions, and the addition of dichalcogenides to alkynes occurred stereoselectively to give exclusively the corresponding Z isomers. We observed that the selectivity control was governed by the effective participation of the hydroxyl group from propargyl alcohols. In addition, the bis-chalcogenide alkenes were exclusively obtained with propargyl alcohol having the acidic hydroxyl group proton. Conversely
In the presence of catalytic amount of cesiumhydroxide, the hydrothiolation of alkynylsulfides occurred at room temperature in DMF under nitrogen atmosphere to afford exclusive (Z)‐1,2‐diorganothio‐1‐alkene in excellent yields. It could provide a new and expedient way for the preparation of symmetrical and unsymmetrical (Z)‐1,2‐diorganolthio1‐1‐alkenes.
A facile and general method for palladium-catalyzedstereoselective bisthiolation of terminalalkynes with allyl phenyl sulfides has been developed. The scope and versatility of the reaction have been demonstrated, and a broad range of substrates bearing electron-donating and -withdrawing groups on the aromatic rings were all compatible with this reaction, providing the desired (Z)-1,2-dithio-1-alkenes
已经开发了一种用于钯催化的末端炔烃与烯丙基苯硫醚的立体选择性双硫醇化的简便通用方法。该反应的范围和多功能性已经得到证明,并且在芳环上带有给电子和吸电子基团的广泛底物都与该反应相容,提供了所需的 ( Z )-1,2-dithio-1 -烯烃的产率适中至良好。初步机理研究表明,所需产物的硫源可以通过两分子烯丙基苯基硫醚的C-S键断裂依次掺入炔烃中,排除了乙烯基硫醚、炔基硫醚和二硫化物中间体参与其中的可能性。反应。